Tunnel and Pipe Rehabilitation
Infrastructure renewal and improvement for a growing world.
Functioning underground infrastructure is essential to our well-being. Most of us do not think much about it until problems arise. Caring for our nation’s underground assets, often decades old and in need of repair, is an ongoing challenge that water, wastewater and stormwater utility owners contend with each day. Our Pipe and Tunnel Rehabilitation Team has extensive knowledge of pipe material properties and its composite relationship with system stiffness, soil/structure interaction, constructability, and the benefits and limitations of various technologies which can help you rehabilitate and reinforce your subsurface assets.
Design of rehabilitation methods include: cured-in-place pipe (CIPP); diameter reduction (swadgelining), sliplining, pipe bursting, spincast geopolymer, spirally wound steel reinforced PVC liner, fiber reinforced polymer, UV cured polymer and shotcrete.
Tunnel and Pipe Rehabilitation Capabilities
- In-person and ROV mapping and condition assessment
- Subsurface geotechnical investigation to characterize ground conditions
- Feasibility and technology evaluation
- 3D finite element modeling
- Constructability analysis
- Risk screening
- Tunnel grouting and flexible liner design
Tunnel and Pipe Rehabilitation Projects
Our Tunnel and Pipe Rehabilitation Team
Nick Strater, PG
Trenchless and HDD Sectors Leader
Bedford, NH
Nick Strater, PG's Bio
Nick Strater, PG
Trenchless and HDD Sectors Leader
Bedford, NH
Nick is leader of our Trenchless and HDD Sectors. His specialties include rock and soil tunnels; trenchless designs ranging from horizontal directional drilling to pilot tube auger bore; microtunneling; rock slope evaluation and stability; rock blasting and, forensic geology. Nick serves on American Society of Civil Engineers Trenchless Installation of Pipelines (TIPS) Committee and ASCE committees developing Manuals of Practice for pilot tube, auger boring, and the Direct PipeTM methods. Mr. Strater is a frequent invited lecturer on the topics of trenchless method selection, design and risk management. He has authored more than 25 industry papers and presentations on topics ranging from trenchless technology to rock slope stability assessment and mitigation strategies.
Brian Dorwart, PE, PG
Trenchless Specialist
Bedford, NH
Brian Dorwart, PE, PG's Bio
Brian Dorwart, PE, PG
Trenchless Specialist
Bedford, NH
Brian has more than 5 decades of experience and has built his career developing efficient trenchless solutions for a variety of applications ranging from new construction to pipe and tunnel rehabilitation. His areas of specialization include interaction of ground to excavation tools and natural environmental processes, and ground modification for construction. He applies this skillset to trenchless technologies including directional drilling and pipe rehabilitation and, construction of small to large tunnels. Using this experience, Brian delivers assessments of existing structures and evidence-based design of situation-appropriate rehabilitation technologies. Brian is a distinguished member of the North American Society for Trenchless Technologies Hall of Fame.
Tom Pullen, PG
Engineering Geologist
Cottage Grove, MN
Tom Pullen, PG's Bio
Tom Pullen, PG
Engineering Geologist
Cottage Grove, MN
Tom leads Brierley’s Upper Mid-West project efforts. He is another of Brierley’s project leaders who bring real-life perspective to design and troubleshooting, as he was a foreman for a utility contractor specializing in trenchless construction prior to his academic education. Tom’s experience includes underground design; geotechnical site characterization; trenchless design and construction; grouting programs and tunnel rehabilitation; and claims analysis and evaluation for both owners and contractors.